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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 75 for “"backfill"”.
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Integral bridge abutment and backfill behaviour
… bridges. Interaction between the abutments and backfill due to thermal movements of the bridge deck leads to the accumulation of soil strain — known as strain ratcheting — which results in increased lateral earth pressures along with settlement at the bridge approach. Uncertainty surrounding …
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Earthquake-induced tilt of retaining wall with saturated backfill
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Backfill pressures within a reinstated trench: The Gatineau field project.
… Gatineau, PQ, to better understand the nature of backfill pressures acting through the reinstated trench and upon buried water pipe. This thesis first presents the general details of this joint project focusing on backfill temperature and pressure data for the period August 1994 to August 1996. …
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Centrifuge modelling of permeability in a heterogeneous coal mine backfill sequence
… in the Highveld of South Africa. Previously backfilled and restored open cast areas are generally zoned for agricultural uses, but with growing pressures on land use, such areas are increasingly being considered for the expansion of infrastructure and regional development. Understanding the …
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Geotechnical characterization of coal refuse for use as a backfill material
… to a much lesser extent in U.S. coal mines, is backfilling. In addition to the possible benefits of subsidence mitigation, backfilling has the potential to increase coal recovery, enhance ventilation control, and to minimize mine fires. Backfilling can also be used as a means of mine refuse …
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The Application of Post Consumer Glass as a Cementing Agent in Mine Backfill
… glass as a cementing agent in underground mine backfills. The underlying theory indicates that glass is pozzolanic and, when used in finely divided form, reacts as an activator to generate binding products, thus contributing to the development of backfill strength. The objective of the research …
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Dynamic Full-Scale Testing of a Pile Cap with Loose Silty Sand Backfill
… base and side friction along the pile cap-backfill interface, and passive earth resistance. Passive earth resistance has been neglected in design due to a limited amount of full-scale testing. This research presents the results of a combination of hydraulic actuator and eccentric-mass …
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Dynamic Testing of a Full-Scale Pile Cap with Dense Silty Sand Backfill
… performed on a pile cap with a dense silty sand backfill condition. Two hydraulic load actuators connected a test pile cap with a reaction cap. The load actuators incrementally loaded the test cap up to 50 mm of displacement. After each load increment, the displacement was held constant while an …
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The range of applicability of models for the flow of high concentration backfill slurries in pipelines
… intended to model the flow of high concentration backfill slurries. These models are the Cooke model for dense phase flow of cyclone classified tailings and the Paterson model for stabilised flow of high concentration full plant tailings. These two materials (cyclone classified tailings and full …
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PMN/PT and rutile LAC voltage breakdown dependency with respect to backfill gas, voltage rates of rise, and pressure
… how they respond to varying pressure, different backfill gasses and three different ramp rates will be investigated. This investigation will utilize theoretical tools such as dielectric stimulated arcing, Paschens law on breakdown as a function of pressure and the Townsend condition in order to …
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Koste-aspekte by terugvulmynbou
… the two most prominent were Trackless mining and Backfill mining. Trackless mining is a process where, as the name indicates, no rails are used. The traditional method of coco-pans pulled by a locomotive to extract the ore from the mine is replaced by mechanical equipment. This equipment is self …
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An experimental and analytic study of earth loads on rigid retaining walls
… to examine the influences of wall height, backfill behavior, and compaction on the magnitudes of backfill loads on rigid retaining walls. Measurements of lateral and vertical backfill loads were made during tests using the Virginia Tech instrumented retaining wall facility. The tests were …
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IMPACT OF SOIL-STRUCTURE INTERACTION ON SEISMIC BEHAVIOUR OF INTEGRAL ABUTMENT BRIDGES
… increased the interaction of the bridge with the backfill and foundation soils. Therefore, the bridge deforms more of the backfill and foundation soil. This mechanism results in increased stresses induced on the bridge due to the deformation of the backfill soil and, therefore, can compromise its …
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Assessment of In-situ Corrosion Conditions at Nevada Mechanically Stabilized Earth Wall Sites: Using Electrochemical Soil Characteristics and Linear Polarization Resistance
… consist of a: concrete facing panel, specified backfill, reinforcing elements, and the retained fill. The interaction of the backfill with the reinforcements, and the reinforcements with the facing panels, produces a system that when properly designed, can be a cost effective engineering …
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The rheology and flow behaviour of high concentration mineral slurries
… and flow behaviour of high concentration backfill tailings are investigated using a modified Balance Beam Tube Viscometer. The viscometer is capable of producing reliable data using a computer based data acquisition system and three different tube diameters. The aim of this research is to …
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Evaluating Performance of Hybrid Geosynthetic-Reinforced Retaining Walls
… (MC) failure criterion. The behavior of the backfill soil in the reinforced soil zone was modelled using the Cap Yield (CY) model and the MC model. The behavior of the reinforcement was described by a strip element with a linearly elastic perfectly plastic behavior. An 8-kPa compaction stress …
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Finite element analysis of time dependent settlements around pile structures
… caused by consolidation due to gravity, due to backfill and due to backfill with external load are investigated. The inclusion of time history is also evaluated.
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Numerical Analysis on Seismic Response of Cantilever Retaining Wall Systems and Fragility Analysis on Motion Response
… walls constructed with cohesive and cohesionless backfill materials was studied. Fully dynamic analysis based on finite difference method was used to evaluate the performance of retaining walls during the earthquake. The analysis response was verified by the experimental study conducted on a …
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Indirect Tissue Scaffold Fabrication via Additive Manufacturing and Biomimetic Mineralization
… scaffold meso-structures are tested: "tube" and "backfill." Two pattern materials are tested [acrylonitrile butadiene styrene (ABS) and investment cast wax (ICW)] to determine which material is the most appropriate for mineralization and sintering. Mineralization is improved through plasma surface …
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The effect of magnesium ions on the current efficiency of magnesium anodes used as cathodic protectors
… or not the magnesium ion concentration in the backfill has a significant effect upon the current efficiency of a pure magnesium anode when used to protect a steel cathode. Accordinging to H.A. Robinson, there should normally be no effect, but he indicated that there is room for doubt in some …
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